Well i cannot see a thread on this topic and ive had a lot of memorable wipes that include:

Heroic Vaults: Boss enraged and wiped out all of the dps in 1 attack.
Heroic UP: Healer stood to close to the dragon boss guy and started the event, resulting in the slaughter of the other fury warrior and himself and then the rest of us as we tried to run.
Heroic Nexus: Tank gets one shotted by the dragonkin that used spells. Healer died. We all died.

thats it for now, most of my wipes have been stupid mistakes but theres bound to be more as i progress in wotlk.

kozom1234 wrote:WE got the boss to 1%, everyone except me died (w00t healing ftw XD) he was dotted up, i ran...he caught me. he had like 2300 left.

Same here

Shadow lab, the ogre who MC...Damn I hate this boss...
We were able to keep the fight by continuously before he kill all of us...
After my second death, I was coming back, and he had 1%...
And I didn't killed him.... (He twoshoted me, while I was thinking if I should have heal or burstdps...)

On our guild's 2nd attemp ever to Kelthuzad, we get him to 1%, and wipe. But since it was 5 AM, we decided to just stop, and then it reset.

Ironforge:

The king guy reset at least 4 times, until he finally simply knockbacked the main tank into Old Ironforge.

Karazhan:

While clearing trash before Attumen, I accidentally pet-pull Midnight. First and only wipe on Attumen of my old guild

During Terestrian Hillhoof, we got him to about 30%, so the ret pally (which topped the charts pre-2.4, well, pre-2.3 too and probably pre-2.2) says in vent "Nice job guys, we got this " Right as he says that, the Main healer gets chained, die, and we wipe.

Last night a few rl friends and i decided to do heroic Culling. we had a tank that i found in lfg so i invited him. he said that he knew how to tank so i didnt question it and he had better gear than i currently do so i was like cool i dont have to respec and get around 130 more def rating. It was fine until Meathook. I had an addon so it wasnt really needed for me to see marks, so i didnt hound him on that (he is one of those ppl who dont understand the importance of marking mobs so dps doesnt spank the wrong mob) and with no ready check he charged in. healer was at half mana, i had roughly 1000 health left because recklessness+deathwish = aggro is mine (i had to go back to fury QQ) and we died. the actual wipe itself pissed alot of us off, but the stuff said in our own private channel made me laugh, we disbanded and i went back to questing.

in AV i wiped many alliance players who were attacking drek. i stoond inside him and a bunch were just outside aggro radius and a gnome warlock put a curse on me which aggroed the boss and ALL of the warmasters so he and like 10 other players got raped.

The priest made a gnoll jump off the ledge with mind control at the beginning of Gnomeregan, thinking he was killed, we moved on, While in the middle of a battle with 4 other Gnolls, the one we MCed off the edge came back with like 20 of his friends.